A) 5 kg
B) 7 kg
C) 17 kg
D) 3 kg
Correct Answer: A
Solution :
Apply law of conservation of linear momentum, Momentum of first par\[~=1\times 12=12\text{ }kg\,m{{s}^{-1}}\]t Momentum of the second part\[=2\times 8=16\text{ }kg\,m{{s}^{-1}}\] \[\therefore \] Resultant momentum \[=\sqrt{{{(12)}^{2}}+{{(16)}^{2}}}=20\,kg\,m{{s}^{-1}}\] The third part should also have the same momentum. Let the mass of the third part be M, then \[4\times M=20\] \[M=5\,kg\]You need to login to perform this action.
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